Fuel burner



Nov. 24, 1936.

W. F. STEINM ETZ FUELBURNER Filed May 5, 1934 3 Sheets-Sheet l INVENTOR/////I//l///////l WITNESS 7 Nov. 24,1936. w. F. STEINMETZ FUEL BURNERFiled May 5, 1954 3 Sheets-Sheet 2 1N VENTOR 1936- w. F. STEINMETZ2,061,938

FUEL BURNER Filed May 5, 1934 3 Sheets-Sheet 3 INVENTOR wmv s f. BY {Q jv Patented Nov. 24, 1936 UNITED STATES PATENT OFFIE 13 Claims.

This invention relates in general to fuel burner apparatus and moreparticularly to an improved grate construction and operation.

Heretofore in burning solid fuels by use of natural draught methodsinfurnaces and heaters fitted with grate systems of the conventional type,difficulties have been encountered that must be overcomein order toaccomplish efficient combustion. These difficulties arise by reason of alack of provision for a sufficient volume of air to pass through thefuel bed, the air being poorly distributed and not brought into propercontact with the burning fuel. Hence the temperature of the air requiredforeificient combustion is not kept up to the high point necessary toignite and consume the highly inflammable hydrocarbonic gases beingdistilled out of the burning fuel. In the previous attempts in the priorart to accomplish smokeless combustion, the grate structure is not soarranged as to insure a volume of air reaching the burning fuel that isdefinitely in excess of the amount required for complete combustion.There has heretofore been lacking the appreciation of the necessity foroscillating a suflicient area of the fuel supporting grate surfaces. Inmany instances there is inadequate means for discharging the ashes whennecessary.

It is therefore specifically among my primary objects of invention toprovide a grate structure capable of supporting a considerable quantityof burning fuel and comprised of relatively moving parts with means forso moving the parts that the agitation and removal of ash deposit fromall parts of the grate structure and into the ash pit may be insured bymeans of a simple single manual operation.

A more general object of my invention is to provide a grate system thatwill increase the efficiency of furnaces and heaters, by rendering morecomplete and economical the combustion of solid fuels, more especiallythe less expensive and more finely crushed sizes, and reducing to aminimum the smoke content escaping through the flue to the chimney,especially with the use of bituminous fuels, thus decreasing the smokenuisance.

Another object is to provide improved means to agitate the bed ofburning fuel to more effectively dislodge the ash that chokes theapertures between grate bars and accumulate adjacent to the gratesurfaces and to more rapidly discharge the ash to the ash pit, therebyrender ing a freer admission of air through the grate structure to aidcombustion.

Another object is to materially increase the area of the grate surfacein proportion to the horizontal area of the combustion chamber ofheaters, thus supplying a more liberal quantity and improveddistribution of the air supply; hence more oxygen to the burning fuel,part of which becomes preheated, passes up, through, around and abovethe fuel bed in support of com-' bustion, increasing ignition of thehighly inflammable mixtures of the distilled hydro-carbon gases, therebyrendering more complete the combustion and intensifying the heatgenerated.

Another object is to provide means for maintaining a compartively deepbed of fuel, so as to increase the interval between stoking periods, incontrast to the conventional fiat grate systems wherein the finercrushed sizes can be burned only by maintaining a very shallow fuel bed,hecessitating frequent stoking periods.

Another object is to provide an improved and simple extensible frame tosupport the superposed fuel supporting grate members that can be readilyadjusted to conform to the various size heaters, utilizing the fixturesprovided in the combustion chambers wherein are employed conventionalgrate bar .systems.

Another object is to provide an extensible shaker device that can beadjusted to position in the identical apertures provided in the front orside of various make heaters to receive the shank formed ends of theirconventional grate bars and adapted for use of the common shaker lever,thus eliminating the necessity of any alteration of the heater forinstallation.

With these and other ends in view I propose as a preferred constructionto provide a central fuel supporting grate section in the general shapeof a dome with a plurality of vertical slots therein. The dome may havea plurality of fin-like members projecting outwardly from its outerconvex fuel supporting surface to more eflicient- 1y agitate the fueland ash adjacent thereto when the dome is oscillated or rotated aboutits vertical axis. Arranged preferably immediately annularly of the domeare a plurality of horizontally disposed rocking or dumping grates eachmovable about a substantially central horizontal pivot. Arrangedpreferably immediately annularly of these rocking grates is asubstantially vertical or upwardly outwardly inclined basket shaped fuelsupporting grate. This basket is preferably comprised of a plurality ofremovable and interchangeable sections for convenience in installation.I also propose to provide a single manually operated means to oscillateall three of these distinct grate units simultaneously. The dome andbasket shaped units oscillate about a common vertical axis, preferablyin opposite directions, while the horizontally disposed rocking grateseach oscillate about its individual horizontal axis.

This means for oscillating simultaneously every member of the entirefuel supporting surface, effectively agitates the fuel bed andefiiciently dislodges the ash that normally collectsadjacent the gratesurfaces and adhere to the apertures formed in same, and also providesfor a ready discharge of ash into the ash pit when necessary or desired.

The general conformation of the entire fuel supporting surface verymaterially increases the grate surface area, the central dome shapedmember being liberally provided with slotted apertures and having aliberal area relative to the total horizontal area of the combustionchamber, it being substantially vertically disposed over the greaterproportion of its height, and projecting well up into the combustionchamber.

The ash shaking system when operated opens up the fuel bed, permittingthe air to enter, and aids the escape from same of the hot hydro-carbongases to the upper levels of the combustion chamber, there to mix withand ignite, the gases being distilled from the upper surface of the fuelbed in support of more efficient combustion, thus generating moreintense heat.

The manual means to oscillate the system may be so devised that theshank formed on its outer end to receive the usual common hand shakerlever, can be adjusted to position in the identical place formerlyoccupied by the shank of the replaced conventional grate bars ofheaters, requiring no alteration of the heater for installation, itbeing arranged to utilize the apertures provided in the front or side ofheaters for their usual common shaker lever.

The above and other features of this invention together with the variousdetails of construction and combination of the parts will now be moreparticularly described by reference to the accompanying drawings andpointed out in the claims.

In the drawings:-

Figure 1 is a partially cut away plan view of the extensible supportingbars.

Figure 2 is a sectional elevation view on the plane of line 22, Figure1.

Figure 3 is a sectional elevation view on the plane of the line 3-3,Figure 1.

Figure 4 is a cross section on plane of line 4-4, Figure 1.

Figure 5 is an elevational View of the extensible shaker device.

Figure 6 is an elevational View in the direction of line 68, Figure 5.

Figure 7 is a cross section on the plane of the line 3-1, Figure 5.

Figure 8 is a plan view of the upper member of the shaker device on theplane of the line 88, Figure 5.

Figure 9 is a plan view of the lower member of the shaker device on theplane of the line 9-9, Figure 5.

Figure 10 is a longitudinal section on the plane of the line II0, Figure6.

Figure 11 is a sectional elevation of the superposed grate system withsupporting bars omitted on the line III I, Figure 12.

Figure 12 is a partially cutaway plan view of Figure 11 with supportingbars omitted.

Figure 13 is a fragmentary typical cross section on the plane of theline I3--I3, Figure 11, with supporting bars omitted.

Figure 14 is a partially fragmentary perspective View of entire assemblyof the fuel burner.

Referring more particularly to the drawings the member I is providedwith a journalled end 2 for insertion in the conventional burner socketfor supporting the grate and is cast with a spindle 20 for attachment toa shaker device, later to be described. Assembled members I, I and I, Irespectively are interlocked by having wedge shaped lugs 3 formed ontheir inwardly disposed extremities which are inserted in the slottedapertures 4 having chamfered or beveled surfaces causing the lugs 3 andthe slots 4 to position in male and female relationship; the slottedapertures 4 being enlarged by cutting away the chamfered surfaces 5 at 6to form entry for the lugs 3 which are dimensioned to fit rather snuglyin the apertures 4, Figure 4, thus permitting the bars I, I and I, I,respectively to slide longitudinally in engagement with one another.When they are adjusted to their required extent they are locked inposition by the bolt I. Transversely disposed in relation and secured tothe assembled bars I, l and I, I respectively are two extensible tie barassembles (identical in construction) each consisting of two bars 8 andone bar 9; the members 8 and 9 are interlocked by having the upwardlyprojecting wedge shaped lugs I4 formed on both ends of the member 9which are inserted in the slotted apertures I5 having chamfered surfacesI6, causing the lugs I 4 and the slots I5 to position in male and femalerelationship, the slotted aperture I5 being enlarged by cutting away thechamfered surface IB and I! to form entry for the lugs I I which aredimensioned to fit rather snugly in the apertures I5, thus permittingthe members 8 and 9 to slide longitudinally in engagement with oneanother. When the assembly of members 8 and 9 are adjusted to theirrequired extent, they are locked in position by the bolts I8 passingthrough the apertures I5 and IQ of members 8 and 9 respectively.Extending downwardly on the outwardly disposed extremity of the members8 are the flanges I0 provided with the apertures II to receive the boltsI2 affording means to secure the members 8 to the bars I, I and I, Irespectively. Projecting outwardly, molded on flanges I9 are the lugs I3dimensioned and adapted to enter the slotted apertures 4 to insure thebars 8 against downward vertical displacement and rotation relative tobars I, I and I, I.

Bolts I8 also pass through the slotted apertures 49 in the flange 39,(Figures 11, 13 and 14) of the base unit 38, thus acting in the dualcapacity of locking members 8 and 9 into a rigid bar and securing thesuperposed grate structure (hereinafter to be described) to saidassembly of the members 8 and 9 which in turn are secured to supportingbars I, I and I, I. The extensible supporting bars I, I and I, I incombination with the tie bar assemblies (consisting of the members 8 and9) form an adjustable rectangular and horizontally disposed supportingframe, the rectilineal elements of which are adjustable laterally.

The extensible shaker device, Figures 5, 6, 7, 8, 9, 10 and 14,consisting of the assembly of the members and 25, is adapted to housethe spindle 26 and is arranged with the outwardly projecting flanges 2|and 22 provided with the apertures 23 and 24 respectively therein tomatch up for insertion of the bolts 24 to secure the upper member 25 tothe lower member 26. The spindle 29 (cast integral with bar I) isarranged with a plurality of equally spaced teeth 21 adapted to positionin male and female relation with the plurality of equally spacedrecesses 28 (Figure 10) formed in the lower member 26, thus affordingmeans to retain and mount assembly of the members 25 and 26 in aplurality of positions on the spindle 20. Integral therewith andextending outwardly on the upper member 25 and co-axial with thelongitudinal axis of the spindle 20, Figures 10 and 14, is a taperedshank 29 (either triangular or rectangular in cross section) adapted toreceive the usual common hand shaker lever (not shown) which affordsmeans to oscillate the assembly of the members 25 and 26 revolubly toand fro about the spindle 20. The outer circular contour 36 of the teeth21 are dimensioned somewhat less than an arc of 180 degrees, Figure '7,to allow clearance so that the assembly of the members 25 and 26 canberevolved to and fro about the spindle 28. The shaker device, by meansof the members 25 and 26, is adjustable to a plurality of positionsalong the spindle 20 so as to fit the requirements of different makestandard heaters. Extending downwardly on the member 26 and integraltherewith are the lugs 3| provided withthe apertures 3| to receive thepin 32, Figure 14, connecting the lugs 3| to the link 33, whose enlargedsurface area 34 is provided with the aperture 35 for insertion of therod 36 which is connected to the lugs 59 of the dome shaped grate 31,Figure 14, thus to transmit the oscillations of the shaker device,Figure 5, to the dome shaped grate unit 3?. The foregoing descriptionsets forth the means provided to support, and the method of connectingthereto of the means to impart oscillating motion to the superposedgrate structure hereinbefore mentioned, and now to be described.

The superposed grate structure, Figures 11, 12, 13 and 14, consists inits entirety of the base unit 35 mutilated crown gear 49 bearing on theflange 59 of the base 38; a plurality of horizontally disposed rockingor dumping grates 44 which bear on the base unit 38 by means of thebrackets 45 and the flange 4|; the dome shaped grate unit 3! bearing onthe base 38 by means of the lugs 56 which pass through the gear 49 andrest on the flange 39, and a plurality of grate sections 69substantially upstanding and connected together in the shape of a basketcircumscribing the dome grate 31 and the rocking grates 44 and. bearingon the journaled members 5| of the said rocking grates 44.

The base unit 38 is preferably molded in two symmetrical segments, forconvenience of installation, union of the segments being accomplished byhaving upwardly projecting flanges 12, diametrically opposite in avertical plane, molded on a horizontally disposed flange 39 and fastenedtogether with a bolt 16. The abutting ends 14 and E5 of an annularmember 81, which is cast integral with the base 38, are'positioneddiametrically opposite and molded to form a scarf-joint I6 and securedby bolts 11. The base unit 38 is substantially L shaped in crosssection, having its inwardly projecting horizontally disposed flange 39arranged with concentrically disposed slotted apertures formed therein,Figures 11, 12, 13 and 14, which are adapted to register with slottedapertures l5 and I9 in the bars 9 and 9. Thus, the slots 40 accommodatethemselves to the adjustability of tie bar assemblies (Figures 1, 2 and3) hereinbefore described, and function to receive bolts l3 anchoringbase 38 to members 8 and 9.

Positioned within the confines of an upstanding flange 4| of the base39, concentric thereto, and bearing on the upper surface 46 of theflange 39 is an annularly formed mutilated crown gear 49 having itsteeth 59 arranged in a plurality of equally spaced groups, each havingan equal number and positioned to engage with teeth 54 molded on gearsegments 53 that are cast integral with rocker grates 44, Figures 11,12, 13 and 14. Molded on the vertically disposed flange 4| of base 38along its upper edge 42 is a plurality of equally spaced semi-circularformed notch-es 43, (Figures 11 and 14) each of which is co-axialrespectively with each of the apertures 41 formed in the upstandingflange 46 of each of the plurality of outwardly projecting brackets castintegral with flange 4|. Each pair of apertures 43 and 41 function asbearings for the reception of journaled members 52 and 5| respectively,which are molded integral with each of the horizontally disposed rockeror dumping grates 44 respectively, thus providing means to supportrocker grates 44 on base 38, Figures 11, 13 and 14.

Each of the plurality of grate sections 60, Figures 11, 12, 13 and 14,forming the upstanding basket grate; bear at its lower edge 6| on eachof the journaled members 5| of the rocker or dumping grates 44respectively, members 5| functioning in the nature of roller bearingsfor the grate sections 60. The revolvable motion of said members 5| isin the same direction asthe oscillations of grate sections 60, so as tominimize the friction between the contacting surfaces 5| and'fil when inmotion. Molded on each grate section 6|] above its lower edge 6|(Figures 11 and 14) is a plurality of downwardly projecting gear teeth62 adapted to engage with the gear teeth 63 molded on each of the gearsegments 55 respectively, which are molded integral with the rockergrates 44 and function to transmit oscillations of the rocker grates 44to the grate sections 60. To insure against undue vertical or horizontaldisplacement of the grate sections and to eliminate the possibility ofdisengagement of teeth 62 and 63 during oscillation of the grate system,each rate section 60 has molded thereon a downwardly projecting L shapedlug 64, its horizontally disposed leg 64 projecting inwardly to positionunder the annular member 81 of the base 38. In order to hold the gratesections 60 in alignment in the form of a basket, there is molded on theadjacent upstanding members 65 and 66 horizontally projecting aperturedlugs 6'! and 68 respectively, being spaced to position in male andfemale relation for insertion of the pin 69. Similarly molded on members65 and 66 at a lower level are apertured lugs 16 and 11 projectingslightly inwardly from contour of grate sections 60 for insertion of pin12, Figure 14.

The dome shaped unit 31 is provided with a plurality of slottedapertures 31 and also has molded on its convex fuel supporting surface aplurality of outwardly projecting fin shaped members 31 which areadapted to agitate the fuel and ash that collect on its fuel supportingsurface when the latter is oscillated. The dome 31 is supported by andis co-axial vertically with base 38 and bears on the upper surface 48 ofthe flange 39 contained therein Figures 11, 13 and 14 by means of aplurality of downwardly projecting and vertically disposed lugs 56molded to its lower member 86 and arranged concentric with the mutilatedgear 49 and spaced respectively to position between the gear segments 53and within the blank spaces 18 provided on the gear 49. Formed on theouter periphery of the gear 49 and within the angular dimensioned boundsof the blank spaces 18 are notches 19, Figure 13, dimensioned to admitthe lugs 56. This affords a means for establishing a fixed relationbetween the dome shaped grate unit 31 and mutilated gear 49. Thus thegear 49 and the grate unit 31 move as a unit about their vertical commonaxis upon the oscillation of the dome 31, the surface 48 of the flange39 functioning as the bearing. The flange 4| is beveled slightly outwardon its inner face 58 (Figure 14) to avoid contact with the lugs 56. Twolugs 59, similar to 56, are positioned diametrically opposite andextended downwardly passing through the slotted apertures 84, Figures 13and 14, formed in the flange 39 of the base 38 and arrangedconcentrically therewith, terminating below the plane of the undersideof the flange 39 (Figure 12), and provided with co-aXial apertures 89 topermit in sertion of the rod 36, which is rigidly fixed to the extendedlugs 59 by its diameter being upset 8|, and threads 82 formed thereon toreceive nuts 83. The rod 39 is connected to the link 33 and locked inposition by a cotter 85, thus affording means to transmit theoscillations of shaker device to the entire superposed grate systemincluding the rockers, basket and dome as hereinbefore described. Thecircumferential length of slotted aperture 84 is dimensioned to fix thelimit of the amount of circumferential oscillation or travel of theextended lugs 59.

It is obvious that while I have illustrated a bu ner that is circular inform, the same principle may be applied to heaters having other forms offire boxes, without deviation from the spirit of my invention.

While I have shown in the illustrative embodiment described, linkmechanism for actuating the dome shaped grate and through it the shakerand basket shaped grates, it is obvious that a rack and pinion gear or asuitable cam could be substituted for the link mechanism. It is alsoobvious that the power actuation could be applied directly to the basketshaped or shaker grates and through them to the dome shaped grate. It isalso obvious that the operating mechanism may be arranged so that theoscillating motions of the dome and basket formed grates would be in thesame instead of opposing directions.

What I claim is:

1. In a fuel burner, a grate structure comprising a substantially domeshaped fuel supporting grate, a plurality of horizontally disposed andcircumferentially arranged pivoted fuel supporting rocking gratessubstantially immediately adjacent to and surrounding said dome shapedgrate, manually operated means for simultaneously imparting anoscillating motion to said dome shaped grate about its vertical axis,and to each of said rocking grates about its respective horizontal axis.

2. In a fuel burner, a grate structure comprising a substantially domeshaped fuel supporting grate, a plurality of horizontally disposed andcircumferentiallv arranged pivoted fuel supporting rocking gratessubstantially immediately adjacent to and surrounding said dome-shapedgrate, a basket-shaped fuel supporting grate with outwardly flaringwalls co-axial with said domeshaped grate and substantially concentricwith said dome-shaped grate and rocking grates, and a manually operatedmeans for simultaneously imparting an oscillating motion to said domeand basket shaped grates about their common vertical axis and to each ofsaid horizontally disposed rocking grates about their respectivehorizontal axes.

3. In a fuel burner, a fuel support comprising three grate unitsincluding a central substantially dome shaped unit, a substantiallyhorizontal unit disposed circumferentially of and substantiallyimmediately adjacent to said central unit and including separate memberseach of which is substantially horizontally pivoted, a substantiallyvertical unit disposed circumferentially of and substantiallyimmediately adjacent to said horizontal unit, said units being movablerelative to each other and means for effecting simultaneous movement ofsaid central unit and said outer vertical unit about a common axis.

4. In a fuel burner, a fuel support comprising three grate unitsincluding a central substantially dome shaped unit, a substantiallyhorizontal unit disposed circumferentially of and substantiallyimmediately adjacent to said central unit and including separate memberseach of which is substantially horizontally pivoted, a substantiallyvertical unit disposed circumferentially of and substantiallyimmediately adjacent to said horizontal unit, said units being movablerelative to each other and means for effecting simultaneous movement ofsaid central unit and said outer vertical unit about a common axis inopposite directions.

5. In a fuel burner, a fuel support comprising three grate unitsincluding a central substantially dome shaped unit, a substantiallyhorizontal unit disposed circumferentially of and substantiallyimmediately adjacent to said central unit and including separate memberseach of which is substantially horizontally pivoted, a substantiallyver-' tical unit disposed circumferentially of and substantiallyimmediately adjacent to said horizontal unit, said units being movablerelative to each other, and means including a single control device foreffecting said movement.

6. In a fuel burner, a fuel support comprising three grate unitsincluding a central substantially dome shaped unit, a substantiallyhorizontal unit disposed circumferentially of and substantiallyimmediately adjacent to said central unit and including separate memberseach of which is substantially horizontally pivoted, a substantiallyvertical unit disposed circumferentially of and substantiallyimmediately adjacent to said horizontal unit, said units being movablerelative to each other and means for effecting simultaneous movement ofsaid central unit and said outer vertical unit about a common axis, saidmeans including a single control device for effecting said movements.

7. In a fuel burner, a fuel support comprising three grate unitsincluding .a central substantially dome shaped unit, a substantiallyhorizontal unit disposed circumferentially of and substantiallyimmediately adjacent to said central unit and including separate memberseach of which is substantially horizontally pivoted, a substantiallyvertical unit disposed circumferentially of and substantiallyimmediately adjacent to said horizontal unit. said units being movablerelative to 7 each other, means for effecting simultaneously a movementof said central unit about its vertical axis and a movement of theseparate members of said horizontal unit each about its substantiallyhorizontal axis.

8. In a fuel burner, a fuel support comprising three grate unitsincluding a central substantially dome shaped unit, a substantiallyhorizontal unit disposed circumferentially of and substantiallyimmediately adjacent to said central unit and including separate memberseach of which is substantially horizontally pivoted, a substantiallyvertical unit disposed circumferentially of and substantiallyimmediately adjacent to said horizontal unit, said units being movablerelative to each other, means for effecting simultaneously a movement ofsaid central unit about its vertical axis and a movement of the separatemembers of said horizontal unit each about its substantially horizontalaxis, said means including a single control device for effecting saidmovements.

9. In a fuel burner, a fuel support comprising three grate unitsincluding a central substantially dome shaped unit, a substantiallyhorizontal unit disposed circumferentially of and substantiallyimmediately adjacent to said central unit and including separate memberseach of which is substantially horizontally pivoted, a substantiallyvertical unit disposed circumferentially of and substantiallyimmediately adjacent to said horizontal unit, said units being movablerelative to each other, means for effecting simultaneously a movement ofsaid outer substantially vertical unit about a vertical axis and amovement of the separate members of said horizontal unit each about itssubstantially horizontal axis.

10. In a fuel burner, a fuel support comprising three grate unitsincluding a central substantially dome shaped unit, a substantiallyhorizontal unit disposed circumferentially of and substantiallyimmediately adjacent to said central unit and including separate memberseach of which is substantially horizontally pivoted, a substantiallyvertical unit disposed circumferentially of and substantiallyimmediately adjacent to said horizontal unit, said units being movablerelative to each other, means for effecting simultaneously a movement ofsaid outer substantially vertical unit about a vertical axis and amovement of the separate members of said horizontal unit each about itssubstantially horizontal axis, said means including a single controldevice for effecting said movements.

11. In a fuel burner, a fuel support comprising three grate unitsincluding a central substantially dome shaped unit, a substantiallyhorizontal unit disposed circumferentially of and substantiallyimmediately adjacent to said central unit and including separate memberseach of which is substantially horizontally pivoted, a substantiallyvertical unit disposed circumferentially of and substantiallyimmediately adjacent to said horizontal unit, said units being movablerelative to each other and means for simultaneously effecting a movementof said central unit about its vertical axis in one direction, amovement of said outer substantially vertical unit about an axis commonwith the axis of said central unit and in an opposite direction theretoand a movement of each of the separate members of said horizontal unitabout its substantially horizontal axis.

12. In a fuel burner, a fuel support comprising three grate unitsincluding a central substantially dome shaped unit, a substantiallyhorizontal unit disposed circumferentially of and substantiallyimmediately adjacent to said central unit and including separate memberseach of which is substantially horizontally pivoted, a substantiallyvertical unit disposed circumferentially of and substantiallyimmediately adjacent to said horizontal unit, said units being movablerelative to each other, means for simultaneously efiecting a movement ofsaid central unit about its vertical axis in one direction, a movementof said outer substantially vertical unit about an axis common with theaxis of said central unit and in an opposite direction thereto and amovement of each of the separate members of said horizontal unit aboutits substantially horizontal axis, said means comprising a singlecontrol device for effecting said movements.

13. In a fuel burner, a fuel support comprising three grate unitsincluding a central substantially dome shaped unit, a substantiallyhorizontal unit disposed circumferentially of and substantiallyimmediately adjacent to said central unit and including separate memberseach of which is substantially horizontally pivoted, a substantiallyvertical unit disposed circumferentially of and substantiallyimmediately adjacent to said horizontal unit, said units being movablerelative to each other, means for simultaneously effecting a movement ofsaid central unit about its vertical axis in one direction, a movementof said outer substantially vertical unit about an axis common with theaxis of said central unit and in an opposite direction thereto and amovement of each of the separate members of said horizontal unit aboutits substantially horizontal axis, said means comprising a singlecontrol device for effecting said movements, said control device beingadjustable as to length and angularity.

WILLIAM F. STEINMETZ.

